package com.hyy.springbootblog.common.advice;


import com.fasterxml.jackson.databind.ObjectMapper;
import com.hyy.springbootblog.common.pojo.Result;
import lombok.SneakyThrows;
import org.aopalliance.aop.Advice;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;


//统一结果返回
@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {


    @Autowired
    private ObjectMapper objectMapper;

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @SneakyThrows//这个注解来自于lombk 可以加try catch
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType,
                                  MediaType selectedContentType,
                                  Class selectedConverterType,
                                  ServerHttpRequest request, ServerHttpResponse response) {
        if(body instanceof String) {//通常情况下，不返回String
                    return objectMapper.writeValueAsString(Result.ok(body));
        }else if(body instanceof Result<?>) {
            return body;
        }

        return Result.ok(body);
    }
}
